{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["Chemical"], "input": "A prospective evaluation of the efficacy and safety of vancomycin was conducted in 54 consecutive patients over a 16 - month period ."}
{"Chemical": ["vancomycin"]}